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Acacia honey is characterized by high nutritional, antioxidant, antibacterial and immuno-modulatory values. This work investigated the presence of short and cyclic peptides in Acacia and Ziziphus honey samples. Acacia honey samples ( Acacia tortilis  and  Acacia hamulosa ) and three Ziziphus honeys ( Ziziphus spina-christi ) were screened for their short and cyclic peptide contents using the LC-MS and the chemical structure databases. Moreover, the total protein content was determined using the Bradford method. The  A. tortilis  honey contained three short peptides; HWCC, DSST, and ECH, and the  A. hamulosa  honey sample contained five short peptides and one cyclic peptide. The short peptides of the  A. hamulosa  honey were Ac-GMGHG-OH (Ac-MGGHG-OH), Boc-R(Aloc)2-C(Pal)-OH, H-C (1)-NEt2·H-C (1)-NEt2, APAP (AAPP), and GAFQ (deamino-2-pyrid-4-yl-glycyl- dl -alanyl- dl -norvalyl- dl -asparagine). The cyclic peptide of the  A. hamulosa  honey was  cyclo [Aad-RGD- d -F] ( cyclo [Aad-Arg-Gly-Asp- d -Phe]). The Ziziphus honey was characterized by the presence of either Almiramide B or Auristatin-6-AQ.  A. tortilis ,  A. hamulosa,  and Ziziphus honeys are characterized by the presence of short and cyclic peptides which may contribute to their medicinal values.

Presence of short and cyclic peptides in Acacia and Ziziphus honeys may potentiate their medicinal values